In most cases,a gene in which a child has a defect will show a normal function in only one parent.

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Quizplus · Accepted Answer

In some cases, both parents can have a defective gene that leads to the child's defect. Additionally, certain genetic mutations may occur spontaneously in the child, without either parent having the defective gene. Therefore, it is not always true that a gene with a defect will show a normal function in only one parent.

In Most Cases,a Gene in Which a Child Has a Defect